add dynamo-backup-to-s3

dynamo-backup-to-s3/Dockerfile

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+FROM alpine:3.2
+
+MAINTAINER Ric Lister <rlister@gmail.com>
+
+RUN apk add --update nodejs && \
+    npm install dynamo-backup-to-s3 -g
+
+ENTRYPOINT [ "dynamo-backup-to-s3" ]

dynamo-backup-to-s3/README.md

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+# dynamo-backup-to-s3
+
+This is a minimal image built on Alpine Linux and nodejs to run
+[dynamo-backup-to-s3](https://github.com/markitx/dynamo-backup-to-s3).
+
+## Usage
+
+```
+docker run -d --name dynamo-backup-to-s3 \
+  -e AWS_ACCESS_KEY_ID \
+  -e AWS_SECRET_ACCESS_KEY \
+  -e AWS_DEFAULT_REGION \
+  rlister/dynamo-backup-to-s3:latest \
+  -b my-s3-bucket/path \
+  table1,table2,...
+```
+
+It is generally preferable to deploy to an ec2 instance with a
+suitable IAM role rather than passing AWS secrets in the environment.